Remove imageSupportRequired parameter to runTestHarness (#1077)

* Tests requiring image support use runTestHarnessWithCheck

Removing special case for images in runTestHarness.

Fixes #710

* Remove imageSupportRequired argument

Tests which require image support now specify this while
calling runTestHarnessWithCheck.

Fixes #710

Signed-off-by: Ellen Norris-Thompson <ellen.norris-thompson@arm.com>

test_conformance/computeinfo/main.cpp

@@ -1455,6 +1455,5 @@ int main(int argc, const char** argv)
         }
     }
 
-    return runTestHarness(argCount, argList, test_num, test_list, false, true,
-                          0);
+    return runTestHarness(argCount, argList, test_num, test_list, true, 0);
 }